File or rasp



(No Model.)

O. OLSON.

FILE 0B RASP.

P-atented Nv. 2, 1897.

a AE

UNITED STATES PATEN'r union..

OTTO OLSON, OF REDDING, CALIFORNIA.

FILE OR RASP.

SPECIFIGATION forming part of Letters Patent No. 593,028, dated November 2, 1897. Application fil January 27, 1897. erial No. 620,876. (NO modeli) To all whom it may concern;

Be it known that I, OTTO OLSON, a citizen of Sweden, residing at Redding, county of Shasta, State of California, have invented an Improvem ent in Files or Rasps; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to an improved tool for eroding or cutting away surfaces.

It is especially applicable for the manufacture of coarse rasps -and files, and may also he employed for Smooth-cutting tools.

It consists, essentially, of aholder and a series of curved cutting tools or hits, with means for removably securing them in the holder so' as to present the cutting edges in position for work.

Referring to the accompanying drawings, Fgure l is a side view of my file or rasp. Fig. 2 is a cross-section through the same. Fig. 3 shows the position of the hits while being sharpened.

A is a holder, which is shown in the present case consisting of a back of suificient width with turned-over edges a.

The hits or cutters B are in the present case shown with toothed edgcs formed upon one edge of a hollow concaved surface of steel, the hack being correspondingly convex and the edge heveled toward the teeth, so that the latter may be sharpened by simply grinding this edge. The opposite edge of the hit is formed with lu gs b and an intervenin g groove or channel between these lugs and the bit. This groove or channel fit-s the turned-over edges of the holcler, and each of the hits or cutters may he slipped into the holder, one following the other, until the holder is filled with these hits lying closely against each other, and the cutting edges proj ecting in series transversely across the face.

The hits are separated from each other by means of small wedges C, which are dropped in between the cutters, so as to bring the edge-s up to a perfect uniform level to he sharpened.

The opposite ends of the holder are turned up, as shown at D, and through these turnedup ends pass the screw-shanks E of the handle at one end and a oorresponding screw F at' the opposite end. These screws may he turned so as to hind the cutters firinly in place, and the tool is then in condition for use without wedges.

If it is desired to remove or change the cutters, it can he done by simply loosening the screws and reinoving the cutters, and they may be inserted in the same manner when the screws are turned hack sufficiently for the purpose.

To sharpen the cutters, the wedges O are placed between the hases of the cutters to bring the beveled faces in the same plane, where they are locked until ground, then the wedges removed and the cutters locked together for use with the cutting edges slightly raised, as in Fig. 1.

The advantage of making the cutters orhits curvedinstead of straight is that on the introduction of the wedges between the cutters the edges of the cutters are all brought into one plane for sharpening. Vvhen a Wedge is placed between two cutters, their hases are separated by the thickness of the Wedge, and on their being clamped together the upper portion of the rearinost cutter is thrown forward by reason of the point of the clamping-screw being above the top of the Wedge, and the surfaces of two or more cutters are thus brought into the same plane, the same result following the insertion of each additional wed ge. If the cutters were straight, the interposed wedges would merely separate theinby a distance corresponding with the thickness of the Wedge and they would retain their .npright position and their'surfaces would not readilyflbei brought into. the same plane for grinding.

Having thus described my invention, what I claim as new, and desire to secureby Letters Patent, is-

1. An improved cutting-tool or file consisting of a holder having at its opposite ends upturned threaded lugs, and having upturned sides provided with inwardly-turned edges, a series of hits or cutters fitted within the holder and having grooves or channels to receive the inturned edges of the holder, said hits or cu'tters being of curved form in cross-section and having beveled edges, and a screw at each end of the holder adjustably fitted to the npturned lugs thereof and abutting against the cutters to Secure them fimnly in place.

2. The eombnation With an abrading or cntting tool having a series of independent bits or cutters placed face to face, of ,means for Afaoil't-ating the sharpening of the bts or cut-- ters consisting of Wedges placed between the j bases of the bits or eutters to bring their opposite faces in the same plane. 1o

In Witness Whereof Ihave hereunto set my hand.

OTTO OLSON. Witnesses:

F. M. SWAsEY, O. E. WILLIAMS. 

